CN105057626A - Control system and method for grain refinement of corners of continuous casting billets - Google Patents
Control system and method for grain refinement of corners of continuous casting billets Download PDFInfo
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- CN105057626A CN105057626A CN201510534316.3A CN201510534316A CN105057626A CN 105057626 A CN105057626 A CN 105057626A CN 201510534316 A CN201510534316 A CN 201510534316A CN 105057626 A CN105057626 A CN 105057626A
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Abstract
The invention provides a control system and method for grain refinement of the corners of continuous casting billets, and belongs to the field of steel making and continuous casting. According to the control system and method, a cooling water spraying mechanism and a non-contact type infrared online temperature measuring device are introduced on the two sides of strand of a vertical area of a vertical bent section of a continuous casting machine, and the online temperature measuring device uploads the temperature of the corners of the casting billet located on the bent point of the vertical bent section and the temperature of the corners of the casting billets located at an outlet of the vertical bent section to an upper computer in real time; according to the temperature requirement of the corners of the casting billets and the requirements of precipitation and dispersed cooling and double-phase-change crystal grain refining of micro alloy carbon carbonitride of corner structures of the micro alloy steel continuous casting billets, the water quantity of a foot roller wide/narrow surface of the continuous casting machine, the water quantity of the spraying mechanism and the water quantity of all areas in the vertical bent section are dynamically controlled; cooling of the corners of the casting billets with different section widths in the vertical bent section is intelligently and accurately controlled in the continuous casting production process, so that the temperature evolution control requirements of dispersed precipitation and crystal grain refining of micro alloy carbonitride, in the vertical bent section, of the corner structures of the micro alloy steel casting billets of different types are met.
Description
Technical field
The invention belongs to steel smelting-continuous casting field, be specifically related to a kind of control system and method for continuous casting billet bight grain refinement.
Background technology
In steel, add microalloy element can make it produce good grain refinement and precipitating reinforcing effect in hot procedure, the mechanical properties such as the toughness of General Promotion steel and intensity; But in actual micro-alloyed steel continuous casting production process, its casting blank solidification crack sensitivity is higher, strand bight takes place frequently micro-transverse crack defect, has become the common technology difficult problem that restriction micro alloyed steel is high-quality and high-efficiency reform is urgently to be resolved hurrily;
The essential reason that micro-alloyed steel continuous casting base produces transverse corner crack is such steel casting blank solidification process, in steel, microalloy element easily and C, the elements such as N combine and form carbide, nitride or carbonitride, and be that chain form is separated out in a large number at austenite grain boundary, and aggravate the formation of austenite grain boundary pro-eutectoid ferrite film thus, cause strand bight to organize grain-boundary strength significantly to reduce.Strand with under straightening force effect, very easily organizes crystal boundary stress concentrate and cause transverse crack bending in strand bight; Therefore, control microalloy continuous casting billet bight process of setting microstructure evolution, Integral lifting strand bight organize plasticity to be fundamentally eliminate the key of micro-alloyed steel continuous casting base transverse corner crack generation; The effective means realizing this object is then that crystallite dimension is organized and its intracrystalline of dispersion and crystal boundary microalloy Carbonitride Precipitation in refinement strand bight;
Casting blank crystal grains refinement is controlled, implement strand bight and organize the two transformation behavior of process of setting (namely, continuous casting billet structure is made to be transformed into ferrite by austenite fast at high-temperature region process of setting, then by ferrite fast temperature rising to austenite) be then a kind of effective thin brilliant control device of continuous casting billet structure; And according to strand bight temperature evolution feature, possess and carry out strand bight and organize this two-phase to become the position of Controlling Technology to concentrate in conticaster foot roller and vertical curved segment;
And organize Carbonitride Precipitation effective ways to be adopt larger cooling velocity to cool high-temperature steel tissue in corresponding Carbonitride Precipitation humidity province for dispersion casting blank solidification, make the first procatarxis of microalloy and C, N etc. in continuous casting billet structure cannot rapid diffusion and dispersion continuous casting billet structure intracrystalline and crystal boundary are separated out; For current both at home and abroad output higher produce containing Nb with containing B micro alloyed steel for, the Precipitation Temperature district of its casting blank solidification process carbonitride is about 800 ~ 1125 DEG C, the corresponding position of this temperature on continuous casting machine casting stream, strand bight is crystallizer middle and lower part, sufficient roller and vertical curved segment, and mainly concentrates on sufficient roller and vertical curved segment region; Therefore, if strand bight can be realized organize grain refinement, its organize cooling velocity can guarantee Nb (C, N) in steel and BN etc. in the strand bight that quick ferritizing process provides precipitate is organizing intracrystalline and crystal boundary disperse educt;
For this reason, need implement in earlier stage to cool fast to strand bight early stage in casting machine foot roller and vertical curved segment, complete strand bight tissue fast by austenite to ferritic transformation, and realize the interior microalloy carbonitride of its tissue and separate out in intracrystalline and crystal boundary dispersion.Immediately, in the vertical curved segment middle and later periods, need guarantee that strand bight fast temperature rising is to complete austenitizing temperature, realize strand bight tissue and changed to austenite by ferrite, complete twice phase transition process, realize organizing grain refinement;
The patent No. is the patent of invention of 201010259985.1, disclose a kind of standing at conticaster and overallly in curved segment increase that continuous casting billet is wide, the leptoprosopy water yield 2 ~ 5 times, guarantee that casting billet surface cools speed cooling with 3 ~ 10 DEG C/s, control the method that blank surface organizes crystal boundary microalloy element Carbonitride Precipitation.But this patented technology entirety increasing continuous casting billet is wide, the leptoprosopy water yield, certainly will accelerate the overall setting rate of strand, change casting blank solidification end position, thus change casting blank solidification end soft reduction process; Secondly, this patent only guarantees casting billet surface fast cooling, and it is only useful to suppression Carbonitride Precipitation, but to rise again Controlling Technology without strand, excessive casting billet surface cooling velocity very easily induces casting billet surface to generate the tissues such as the higher martensite of crack sensitivity, crackle on aggravation casting billet surface generation face; Moreover, actual continuous casting production process, the strand leptoprosopy that conticaster stands in curved segment does not generally carry out water-spraying control, only under traditional casting machine equipment condition, implements this patented technology, and strand bight temperature often cannot realize real fast cooling; In addition, this patented technology owing to lacking strand bight temperature feedback, also cannot in time, accurately in Dynamic controlling continuous casting production process due to strand bight variations in temperature that the technique change such as pulling rate and molten steel overheat causes.
Equally, the patent No. is the patent of invention of 201210348907.8, discloses a kind of two cold controlled cooling methods reducing micro alloyed steel slab transverse corner crack line, by controlling cooling water inflow in vertical curved segment and water spraying mode, with 3 ~ 8 DEG C/s cooling velocity cooling strand, realize the cold by force of strand; The method and the patent No. be 201010259985.1 patent thought similar, same adopt the overall mode increasing the continuous casting billet water yield to realize strand bight to cool by force.Therefore.Casting blank solidification end soft reduction process can be caused equally to change and due to lack strand bight temperature feedback and cannot in good time, the accurately problem such as the strand bight variations in temperature that causes due to the technique change such as pulling rate and molten steel overheat of Dynamic controlling continuous casting production process;
In addition, in actual steel continuous casting production process, the section width of strand often changes, and above-mentioned patent does not all relate to the correlation technique and method that match with casting blank section change width yet, does not have universality;
Control with precision with intellectuality of rising again greatly to realize the strong cooling of bight temperature in sufficient roller and vertical curved segment in different section micro alloyed steel sheet billet continuous casting production process, realizing micro-alloyed steel continuous casting base bight organizes the precipitation of microalloy carbonitride dispersion to become grain refinement Precise control with two-phase, strand bight is made to generate the tissue of high-ductility, strong cracking resistance line ability, and follow-up strand production technology can not be changed after ensureing to implement the strong process for cooling in this bight, the system and method that a kind of intelligence accurately controls the grain refinement of continuous casting billet bight need be developed.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of control system and method for continuous casting billet bight grain refinement, to realize intellectuality, the cooling of precision control different section size micro-alloyed steel continuous casting base production process bight in conticaster foot roller and vertical curved segment, realizing strand bight organizes microalloy element carbonitride dispersion to separate out and its crystallite dimension Precise control of attenuating of two-phase, reach significantly raising strand bight and organize cracking resistance line ability, at utmost can reduce again the object that corresponding technique impacts follow-up continuous casting production control technique simultaneously.
A control system for continuous casting billet bight grain refinement, this system comprises: realize host computer that strand bight temperature intelligent controls, PLC, casting blank section change width can be adapted to and for strand bight spraying cooling cool water shower device, compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device can be led to;
Wherein, described cool water shower device is arranged at crystallizer narrow-face foot roller fixed head lower end and is fixedly connected with it, described strand bight Non-contact Infrared Temperature Measurement device is arranged at cool water shower device lower end and is fixedly connected with it, described host computer input connects strand bight Non-contact Infrared Temperature Measurement device, the output of host computer connects the input of PLC, and the output of PLC connects cool water shower device.
Described adapted to casting blank section change width for the cool water shower device of strand bight spraying cooling, this device comprises: spraying rack and shower, and described spraying rack comprises a vertical main fixed bar and multiple shower connecting rods of level;
Wherein, described main fixed bar is fixedly connected with the horizontal centre position of shower connecting rod and communicates, form water supply loop, described multiple shower connecting rods are arranged in main fixed bar along casting flow path direction by same intervals width, and described shower connecting rod two ends are respectively provided with shower.
Described shower is installed on the two ends of each shower connecting rod according to certain angle, and described certain angle is: when outer arc angle portion in strand aimed at by shower, the angle that shower and shower connecting rod are formed; Described shower, its nozzle is circle or the flat nozzle with 60 ° ~ 80 ° of spray angles.
It is concordant that described main fixed bar lower end and strand found curved segment buckled zone entrance.
Described water supply loop is connected with crystallizer narrow-face foot roller section water supply loop.
Described leads to compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device, this device comprises: can lead to compressed-air actuated infrared temperature probe fixed mount and infrared temperature probe, and described infrared temperature probe fixed mount comprises: the infrared temperature probe connecting rod of a vertical main fixed bar of infrared temperature probe, two levels and four infrared temperature probe placing devices;
Wherein, the main fixed bar of described infrared temperature probe is fixedly connected with the horizontal centre position of infrared temperature probe connecting rod and communicates, form ventilating return, the infrared temperature probe connecting rod of two described levels lays respectively at strand and founds curved segment buckled zone entrance and strand stands curved segment exit, described infrared temperature probe placing device is arranged at infrared temperature probe connecting rod two ends, and it is inner that infrared temperature probe is arranged at infrared temperature probe placing device.
Described infrared temperature probe placing device, its one end communicates with infrared temperature probe connecting rod, the other end is opening, this opening aims at outer arc angle portion in strand, infrared temperature probe placing device inside is provided with the draw-in groove for fixing infrared temperature probe, and above-mentioned draw-in groove is circumferentially evenly distributed with the through hole for blast injection.
Described infrared temperature probe main fixed bar upper end is fixedly connected with outside the main fixed bar of spraying rack, and infrared temperature probe main fixed bar upper end is concordant with the main fixed bar upper end of spraying rack, and the main fixed bar upper end of infrared temperature probe is connected with compressed air piping.
The output line of described infrared temperature probe is connected with host computer with compressed air piping by infrared temperature probe fixed mount.
The control method adopting the control system of continuous casting billet bight grain refinement to carry out, comprises the following steps:
Step 1, according to the complete ferritizing temperature of produced steel grade and complete austenitizing temperature requirement, determine the target surface temperature of continuous casting billet bight in the completely ferritizing and vertical curved segment exit complete austenitizing in vertical curved segment buckled zone porch, and be arranged in host computer;
Step 2, according to set target surface temperature, adopt numerical simulation computational methods to simulate the temperature field in the cold sufficient roller Duan Yuli curved segment of continuous casting billet two, thus the cold sufficient roller section of the casting machine two determining to meet above-mentioned target surface temperature requirement wide initial water yield, the initial water yield of the cold foot roller segment narrow surface of casting machine two, the four initial water yields in district and casting blank section change width can be adapted to and for the initial water yield of cool water shower device of strand bight spraying cooling in the three initial water yields in district, vertical curved segment in the two initial water yields in district, vertical curved segment in vertical curved segment;
Step 3, start up system, cool water shower device sprays outer arc angle portion in strand, and adopt the surface temperature of the current continuous casting billet of infrared temperature probe Real-Time Monitoring in each bight of vertical curved segment buckled zone entrance and vertical curved segment exit, and the temperature value of collection is sent in host computer carries out periodicity storage;
Step 4, target surface temperature according to the temperature value and the setting that gather, regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, the cooling water inflow that issues that stands curved segment two district and cool water shower device water route, concrete steps are as follows:
Step 4-1, according to the cycle gathered, to gathered vertical curved segment buckled zone entrance four strand bight temperature averaged respectively;
Whether step 4-2, judgement vertical curved segment buckled zone entrance strand each bight temperature averages are greater than the target surface temperature value of setting, if so, then perform step 4-3, otherwise, perform step 4-4;
Step 4-3, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient are 1, and cool water shower device water route increment of adjustment coefficient is 2, performs step 4-7;
Whether step 4-4, the vertical absolute difference between curved segment buckled zone entrance strand each bight temperature averages and the target surface temperature value of setting of judgement are less than or equal to the tolerance of setting, if so, then perform step 4-5, otherwise, perform step 4-6;
Step 4-5, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient are 0, perform step 4-7;
Step 4-6, set cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient as-1, upper cool water shower device water route increment of adjustment coefficient is-2, execution step 4-7;
Step 4-7, cold wide of the sufficient roller section of casting machine two according to setting, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient, be multiplied by increment of adjustment, automatically regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route issue cooling water inflow;
Step 4-8, according to the cycle gathered, to four, gathered vertical curved segment exit strand bight temperature averaged respectively;
Whether step 4-9, judgement vertical strand each bight, curved segment exit temperature averages are less than the target surface temperature value of setting, if so, then perform step 4-10, otherwise, perform step 4-11;
Step 4-10, set the water route increment of adjustment coefficient in casting machine two Leng Sanqu and 4th district as-1, perform step 4-14;
Whether step 4-11, the vertical difference between curved segment exit strand each bight temperature averages and the target surface temperature value of setting of judgement are less than or equal to the tolerance of setting, if so, then perform step 4-12, otherwise, perform step 4-13;
The water route increment of adjustment coefficient in step 4-12, setting casting machine two Leng Sanqu and 4th district is 0, performs step 4-14;
The water route increment of adjustment coefficient in step 4-13, setting casting machine two Leng Sanqu and 4th district is 1, performs step 4-14;
Step 4-14, water route increment of adjustment coefficient according to casting machine two Leng Sanqu and 4th district of setting, be multiplied by increment of adjustment, automatically adjustment casting machine two Leng Sanqu and four water routes, district issue cooling water inflow;
Step 5, return perform step 3, until throwing terminates.
Advantage of the present invention:
The present invention proposes a kind of control system and method for continuous casting billet bight grain refinement, introduce can adapt to casting blank section change width and for the cool water shower mechanism of the strong spraying cooling in strand bight with install in vertical curved segment buckled zone entrance and vertical curved segment exit can the non-contact infrared In-Line Temperature Measure System of Real-time Feedback strand bight temperature by standing Zhu Liu both sides, curved segment vertical area at conticaster, the strand bight temperature of strand bight in vertical curved segment bending point and vertical curved segment exit is uploaded to strand bight Temperature Intelligent Control System by In-Line Temperature Measure System in real time, strand bight Temperature Intelligent Control System organizes the cooling of microalloy Carbonitride Precipitation dispersion to become refining temperature requirement with two-phase according to strand bight temperature according to different micro-alloyed steel continuous casting base bight, Dynamic controlling conticaster foot roller wide/leptoprosopy, the water yield in above-mentioned spraying mechanism and vertical curved segment Nei Ge district, intelligence, the accurate cooling of control continuous casting production process different section width strand bight in vertical curved segment, the microalloy carbonitride dispersion precipitation be woven in vertical curved segment to meet dissimilar micro alloyed steel strand set of corners develops requirement with grain refinement control temperature,
The present invention can accurately, the intensity of cooling of Based Intelligent Control continuous casting billet in vertical curved segment, realize twice phase transformation in strand bight, refinement its organize crystallite dimension and dispersion its organize intracrystalline and crystal boundary microalloy Carbonitride Precipitation; The present invention, by introducing for the strong spraying cooling spraying mechanism in strand bight, at utmost can reduce the impact that Controlling Technology implementation process produces subsequent production technique; The present invention can accurately control the temperature of continuous casting billet bight in vertical curved segment corresponding target temperature ± 5 DEG C among a small circle in fluctuation; The present invention has stronger applicability, and the continuous casting billet being applicable to current iron and steel enterprise main flow conventional plate blank and Slab Caster arbitrary cross-section width and crucial steel grade is produced.
Accompanying drawing explanation
Fig. 1 is the control system schematic diagram of the continuous casting billet bight grain refinement of an embodiment of the present invention, wherein, 1 be host computer, 2 be PLC, 3 be cool water shower device, 4 be strand bight Non-contact Infrared Temperature Measurement device, 5 be crystallizer narrow-face foot roller section, 6 for strand;
Fig. 2 be an embodiment of the present invention adapted to casting blank section change width and for the cool water shower apparatus structure schematic diagram of strand bight spraying cooling, wherein, 3-1 is spraying rack, 3-2 is shower, 3-1-1 is main fixed bar, 3-1-2 is shower connecting rod;
Fig. 3 is cool water shower device and the strand bight Non-contact Infrared Temperature Measurement device top view of an embodiment of the present invention, and wherein, 4-1 is the main fixed bar of infrared temperature probe, 4-2 is infrared temperature probe connecting rod, 4-3 is infrared temperature probe placing device;
Fig. 4 is cool water shower device and the strand bight Non-contact Infrared Temperature Measurement device front view of an embodiment of the present invention;
Fig. 5 is the infrared temperature probe placing device front view of an embodiment of the present invention, and wherein, 4-4 is that infrared temperature probe 4-5 is logical temperature measurement signal transmission line, 4-3-1 is front end draw-in groove, 4-3-2 is rear end draw-in groove;
Fig. 6 is the infrared temperature probe placing device left view of an embodiment of the present invention;
Fig. 7 is the control method flow chart of the continuous casting billet bight grain refinement of an embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, an embodiment of the present invention is described further.
In the embodiment of the present invention, as shown in Figure 1, the control system of continuous casting billet bight grain refinement comprises: realize host computer 1 that strand bight temperature intelligent controls, PLC 2, casting blank section change width can be adapted to and for strand bight spraying cooling cool water shower device 3, compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device 4 can be led to;
In the embodiment of the present invention, as shown in Figure 1, described cool water shower device 3 is arranged at crystallizer narrow-face foot roller fixed head lower end and is fixedly connected with it, makes spraying rack 3-1 overall leptoprosopy being parallel to strand 6 in vertical curved segment; Described strand bight Non-contact Infrared Temperature Measurement device 4 is arranged at cool water shower device 3 lower end and is fixedly connected with it, described host computer 1 input connects strand bight Non-contact Infrared Temperature Measurement device 4, the output of host computer 1 connects the input of PLC 2, and the output of PLC 2 connects cool water shower device 3;
In the embodiment of the present invention, as shown in Figure 2, casting blank section change width can be adapted to and cool water shower device 3 for strand bight spraying cooling comprises: spraying rack 3-1 and shower 3-2, described spraying rack 3-1 comprises 3 ~ 7 shower connecting rod 3-1-2 (in the present embodiment, the number of shower connecting rod 3-1-2 is 6) of a vertical main fixed bar 3-1-1 and level, described main fixed bar 3-1-1 is fixedly connected with the horizontal centre position of shower connecting rod 3-1-2 and communicates, form water supply loop, for shower 3-2 provides cooling water, described multiple shower connecting rod 3-1-2 are arranged in main fixed bar 3-1-1 along casting flow path direction by same intervals width, described shower connecting rod 3-1-2 two ends are respectively provided with shower 3-2, described main fixed bar 3-1-1 and shower connecting rod 3-1-2 is square or circular configuration, and founds curved segment both sides every side installation one pair at strand 6,
In the embodiment of the present invention, the length of whole spraying rack is found curved segment design feature according to different conticaster and determines, and main fixed bar 3-1-1 lower end is concordant with vertical curved segment buckled zone entrance; Spraying rack Breadth Maximum design principle is in the horizontal direction: the distance l between the same row be mounted thereon 2 shower ends
1≤ 3/5 crystallizer exit slab thickness, to guarantee that spraying rack loads in vertical curved segment smoothly; As shown in Figure 3, shower 3-2 is the θ of 16 ° ~ 45 ° with nozzle end and strand wide direction
2angle form is installed on the two ends of often row's shower connecting rod 3-1-2, guarantees that shower 3-2 aims at outer arc angle portion spraying cooling in strand respectively; Meanwhile, in order to increase strand bight catchment area as far as possible, selected shower 3-2 is nozzle spray angle θ
1be circle or the flat nozzle of 60 °-80 °, nozzle end and strand bight distance keep 10 ~ 15cm; Spraying rack water supply loop is connected with crystallizer narrow-face foot roller section water supply loop, by crystallizer narrow-face foot roller section 5 for spraying rack provides pressure at the cooling water of more than 0.6Mpa by the main fixed bar 3-1-1 of spraying rack;
In the embodiment of the present invention, as shown in Figure 4, compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device 4 can be led to, this device comprises: can lead to compressed-air actuated infrared temperature probe fixed mount and infrared temperature probe 4-4, and described infrared temperature probe fixed mount comprises: infrared temperature probe connecting rod 4-2 and four infrared temperature probe placing device 4-3 of a vertical main fixed bar 4-1 of infrared temperature probe, two levels;
In the embodiment of the present invention, infrared temperature probe main fixed bar 4-1 is fixedly connected with the horizontal centre position of infrared temperature probe connecting rod 4-2 and communicates, form ventilating return, there is provided protection for infrared temperature probe and break up the compressed air of strand 6 thermometric region steam and logical temperature measurement signal transmission line 4-5, the infrared temperature probe connecting rod 4-2 of two described levels lays respectively at vertical curved segment buckled zone entrance and vertical curved segment exit, described infrared temperature probe placing device 4-3 is arranged at infrared temperature probe connecting rod 4-2 two ends, it is inner that infrared temperature probe 4-4 is arranged at infrared temperature probe placing device 4-3, infrared temperature probe main fixed bar 4-1 upper end is fixedly connected with outside the main fixed bar 3-1-1 of spraying rack, and infrared temperature probe main fixed bar 4-1 upper end is concordant with the main fixed bar 3-1-1 upper end of spraying rack, infrared temperature probe main fixed bar 4-1 length for extending to the outlet of vertical curved segment along casting flow path direction from spraying rack upper end, run through whole vertical curved segment, and the material of whole fixture is square tube or the pipe of interior sky, infrared temperature probe main fixed bar 4-1 upper end is connected with compressed air piping, and compressed air is delivered to infrared temperature probe placing device 4-3 place by the main fixed bar 4-1 of this fixture and the infrared temperature probe connecting rod 4-2 that is connected with it,
Infrared temperature probe connecting rod 4-2 Design of length principle is: the distance l between the 2 side infrared temperature probe placing device 4-3 ends be fixedly connected with it
2≤ 3/5 vertical curved segment exit roll gap width, to ensure that temperature probe loads vertical curved segment smoothly; It is the θ of 16 ° ~ 45 ° that infrared temperature probe 4-4 is fixedly installed in infrared temperature probe connecting rod 4-2 two ends according to its shape
3in the tubular that angle is connected or square shape placing device 4-3, as shown in Figure 3.
In the embodiment of the present invention, as shown in Figure 5, infrared temperature probe placing device 4-3, its one end communicates with infrared temperature probe connecting rod 4-2, the other end is opening, and this opening aims at outer arc angle portion in strand 6, and infrared temperature probe placing device 4-3 inside is provided with the draw-in groove (front end draw-in groove 4-3-1, rear end draw-in groove 4-3-2) for fixing infrared temperature probe 4-4, as shown in Figure 6, draw-in groove is circumferentially evenly distributed with the through hole for blast injection, infrared temperature probe 4-4 entirety can wrap up by infrared temperature probe placing device 4-3, and the available protecting infrared temperature probe 4-4 water projection that is cooled arrives, simultaneously, compressed air is gone out by the front end draw-in groove 4-3-1 around temperature probe and rear end draw-in groove 4-3-2 small sircle hole high velocity jet, the steam that thermometric areas adjacent is intended in strand bight can be broken up on the one hand, guarantee infrared temperature probe 4-4 accurate temperature measurement, can prevent cooling water smoke from entering in temperature probe 4-4 on the other hand further, described infrared temperature probe 4-4 is contactless temperature-measuring probe, carry temperature measurement signal output function, it is 10 ~ 15cm that the interregional distance of thermometric is intended in infrared temperature probe 4-4 and strand bight, exactly measured strand bight temperature data can be reached host computer 1 in real time by signal transmssion line by it, data signal line one end is connected with infrared temperature probe 4-4, the other end passes from infrared temperature probe fixture 4-3 inner chamber, be connected to host computer 1, the real time temperature signal that real-time Transmission is sent by infrared temperature probe 4-4 is to the strand bight Temperature Intelligent Control System of position machine 1.
In the embodiment of the present invention, the strand bight Temperature Intelligent Control System of host computer 1 comprises temperature data receiver module, steel grade physical parameter storage/read module, temperature comparisons's discrimination module, loop water yield adjustment module; Described temperature data receiver module, there is the function simultaneously receiving vertical curved segment buckled zone entrance and vertical curved segment exit 8 the strand bight temperature reached in real time by signal transmssion line by 1 secondary frequencies per second, and in real time each for the strand of corresponding position bight temperature is in chronological sequence sequentially kept in corresponding array.Array data length generally gets 5 ~ 10 groups, calculates its mean value, and be sent to temperature comparisons's discrimination module after full 5 ~ 10 groups of data, then automatically removes the data in array, carries out next cycle 5 ~ 10 groups of data receivers and storage; Described steel grade physical parameter storage/read module, store that different steel grade process of setting is completely ferritizing requires that temperature (being generally less than 700 DEG C) and complete austenitizing require temperature (generally getting more than 950 DEG C), and the requirement temperature of correspondence is sent to temperature comparisons's discrimination module; Described temperature comparisons's discrimination module, by temperature data receiver module by and the vertical curved segment buckled zone entrance that sends of storage of array cycle same time interval and 8, vertical curved segment exit strand bight temperature averages and corresponding position completely ferritizing carry out contrast with complete austenitizing requirement temperature and differentiate, obtain each loop water yield increment of adjustment coefficient of wide of caster two cold foot roller section and leptoprosopy, vertical curved segment Nei Erqu, 3rd district, 4th district and cool water shower device, for loop water yield adjustment module, water yield increase and decrease adjustment is carried out to each loop; Described loop water yield adjustment module, according to the runoff investigation increment coefficient that temperature comparisons's discrimination module sends, is multiplied by increment of adjustment, automatically regulates the cooling water inflow in corresponding loop;
In the embodiment of the present invention, PLC adopts the PLC same model with the existing each two cold cooling water runoff investigation in scene, send a control signal to the magnetic valve of cooling 2nd district in the magnetic valve of cool water shower device 3 water supply loop, the magnetic valve of crystallizer narrow-face foot roller section 5 width face water supply loop and vertical curved segment, 3rd district and four district's water supply loops, regulate injection flow rate.
Adopt the control method that the control system of continuous casting billet bight grain refinement is carried out, method flow as shown in Figure 7, comprises the following steps:
Step 1, according to the complete ferritizing temperature of produced steel grade and complete austenitizing temperature requirement, determine the target surface temperature T of continuous casting billet bight in the completely ferritizing and vertical curved segment exit complete austenitizing in vertical curved segment buckled zone porch
1with T
2, and be arranged in host computer;
In the embodiment of the present invention, by target surface temperature T
1with T
2be stored to strand bight Temperature Intelligent Control System steel grade physical parameter storage/read module;
Step 2, according to set target surface temperature, adopt numerical simulation computational methods to simulate the temperature field in the cold sufficient roller Duan Yuli curved segment of continuous casting billet two, thus the cold sufficient roller section of the casting machine two determining to meet above-mentioned target surface temperature requirement wide initial water yield, the initial water yield of the cold foot roller segment narrow surface of casting machine two, the four initial water yields in district and casting blank section change width can be adapted to and for the initial water yield of cool water shower device of strand bight spraying cooling in the three initial water yields in district, vertical curved segment in the two initial water yields in district, vertical curved segment in vertical curved segment;
In the embodiment of the present invention, according to above-mentioned strand bight at the completely ferritizing and vertical curved segment exit complete austenitizing in vertical curved segment buckled zone porch target surface temperature T
1with T
2requirement, utilize numerical simulation computational methods to carry out analog computation to the temperature field in the cold sufficient roller Duan Yuli curved segment of continuous casting billet two, its computational process is:
According to the on-the-spot main flow operating mode of continuous casting (comprising the cooling water inflow in pulling rate, molten steel pouring temperature, the water temperature difference of crystallizer width face cooling water inflow and entrance and outlet, two cold wide of sufficient roller sections and the leptoprosopy water yield, two Leng Erqu, 3rd district and 4th district), by computer utilize Ansys finite element software to set up produce the continuous casting billet two cold temperature field two dimensional finite element Simulation Calculation of steel grade, the cold temperature field of continuous casting billet two is simulated; Then, in two dimensional finite element Simulation Calculation by change wide of casting machine two cold sufficient roller with leptoprosopy, found curved segment two district, 3rd district, 4th district and newly introduce for the different secondary coolingwater design conditions of the spraying mechanism of the strong spraying cooling in strand bight, obtain the thermo parameters method of corresponding continuous casting billet in two cold vertical curved segments; And contrast determined continuous casting billet and stand that curved segment buckled zone entrance is completely ferritizing requires temperature T
1with vertical curved segment outlet complete austenitizing temperature requirement temperature T
2, determine to meet continuous casting billet bight according to results of comparison simultaneously and to reach at two cold vertical curved segment buckled zone entrances and completely ferritizingly require temperature T
1with vertical curved segment outlet complete austenitizing temperature requirement temperature T
2wide of the cold sufficient roller of casting machine two and leptoprosopy, vertical curved segment two district, 3rd district, 4th district and spraying mechanism each loop water yield of newly introducing for the strong spraying cooling in strand bight, and set it to the initial water yield of corresponding each cooling zone;
Step 3, start up system, cool water shower device sprays outer arc angle portion in strand, and adopt the current continuous casting billet of infrared temperature probe Real-Time Monitoring in vertical curved segment buckled zone entrance and bight, each bight, vertical curved segment exit surface temperature, the temperature value of collection is sent in host computer and carries out periodicity storage;
In the embodiment of the present invention, the current continuous casting billet of infrared temperature probe Real-Time Monitoring, in vertical curved segment buckled zone entrance and bight, each bight, vertical curved segment exit surface temperature, is recorded as T respectively
i1(vertical curved segment buckled zone entrance strand the 1st bight temperature), T
i2(vertical curved segment buckled zone entrance strand the 2nd bight temperature), T
i3(vertical curved segment buckled zone entrance strand the 3rd bight temperature), T
i4(vertical curved segment buckled zone entrance strand the 4th bight temperature) and T
o1(vertical curved segment outlet strand the 1st bight temperature), T
o2(vertical curved segment outlet strand the 2nd bight temperature), T
o3(vertical curved segment outlet strand the 3rd bight temperature), T
o4(vertical curved segment outlet strand the 4th bight temperature); And said temperature data are sent in host computer; The temperature data receiver module of the strand bight Temperature Intelligent Control System in host computer receives by 1 secondary frequencies per second the temperature data that each signal transmssion line transmits, and corresponds in the array of 5 ~ 10 groups of temperature sequences by 5 ~ 10s memory cycle sequential storage to length;
Step 4, target surface temperature according to the temperature value and the setting that gather, regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, the cooling water inflow that issues that stands curved segment two district and cool water shower device water route, concrete steps are as follows:
Step 4-1, according to the cycle gathered, to gathered vertical curved segment buckled zone entrance four strand bight temperature averaged respectively;
In the embodiment of the present invention, when full 5 ~ 10 groups of the data stored in the storage array that each strand bight is corresponding, calculating its mean value is T
i1-ave, T
i2-ave, T
i3-ave, T
i4-aveand T
o1-ave, T
o2-ave, T
o3-ave, T
o4-ave, and be sent to temperature comparisons's discrimination module, remove all data in array immediately, carry out the reception of next cycle and store;
Step 4-2, the vertical curved segment buckled zone entrance strand each bight temperature averages T of judgement
i1-ave, T
i2-ave, T
i3-ave, T
i4-avewhether be greater than the target surface temperature value T of setting
1, if so, then perform step 4-3, otherwise, perform step 4-4;
Step 4-3, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient are 1, and cool water shower device water route increment of adjustment coefficient is 2, performs step 4-7;
Step 4-4, the vertical curved segment buckled zone entrance strand each bight temperature averages T of judgement
i1-ave, T
i2-ave, T
i3-ave, T
i4-avewith the target surface temperature value T of setting
1between absolute difference whether be less than or equal to the tolerance 5 DEG C of setting, if so, then perform step 4-5, otherwise, perform step 4-6;
Step 4-5, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient are 0, perform step 4-7;
Step 4-6, set cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient as-1, upper cool water shower device water route increment of adjustment coefficient is-2, execution step 4-7;
Step 4-7, cold wide of the sufficient roller section of casting machine two according to setting, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient, be multiplied by increment of adjustment, automatically regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route issue cooling water inflow;
In the embodiment of the present invention, by obtained water route increment of adjustment coefficient, be multiplied by increment of adjustment 2L/min, under system, solenoid valve opening degree instruction is to PLC, and then PLC triggers corresponding each district water route water rate control magnetic valve, what realize automatically regulating cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district and above-mentioned new introducing for strong spraying cooling spraying mechanism water route, strand bight issues cooling water inflow; Treat that vertical curved segment buckled zone entrance strand bight temperature stabilization is in complete ferritizing temperature T
1after, automatically regulate casting machine to found curved segment Nei Sanqu and four district's cooling water inflows, make the strand bight temperature stabilization in vertical curved segment exit in complete austenitizing temperature T
2;
Step 4-8, according to the cycle gathered, to four, gathered vertical curved segment exit strand bight temperature averaged T respectively
o1-ave, T
o2-ave, T
o3-ave, T
o4-ave;
Step 4-9, vertical strand each bight, the curved segment exit temperature averages T of judgement
o1-ave, T
o2-ave, T
o3-ave, T
o4-avewhether be less than the target surface temperature value T of setting
2, if so, then perform step 4-10, otherwise, perform step 4-11;
Step 4-10, set the water route increment of adjustment coefficient in casting machine two Leng Sanqu and 4th district as-1, perform step 4-14;
Step 4-11, vertical strand each bight, the curved segment exit temperature averages T of judgement
o1-ave, T
o2-ave, T
o3-ave, T
o4-avewith the target surface temperature value T of setting
2between absolute difference whether be less than or equal to the tolerance 5 DEG C of setting, if so, then perform step 4-12, otherwise, perform step 4-13;
The water route increment of adjustment coefficient in step 4-12, setting casting machine two Leng Sanqu and 4th district is 0, performs step 4-14;
The water route increment of adjustment coefficient in step 4-13, setting casting machine two Leng Sanqu and 4th district is 1, performs step 4-14;
Step 4-14, water route increment of adjustment coefficient according to casting machine two Leng Sanqu and 4th district of setting, be multiplied by increment of adjustment, automatically adjustment casting machine two Leng Sanqu and four water routes, district issue cooling water inflow;
In the embodiment of the present invention, according to the water route increment of adjustment coefficient in determined casting machine two Leng Sanqu and 4th district, be multiplied by increment of adjustment 2L/min, under system, solenoid valve opening degree instruction is to PLC, and then PLC triggers corresponding each district water route water rate control magnetic valve, what realize automatically regulating casting machine two Leng Sanqu and four water routes, district issues cooling water inflow;
Step 5, return perform step 3, until throwing terminates.
Claims (10)
1. the control system of a continuous casting billet bight grain refinement, it is characterized in that, this system comprises: realize host computer that strand bight temperature intelligent controls, PLC, casting blank section change width can be adapted to and for strand bight spraying cooling cool water shower device, compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device can be led to;
Wherein, described cool water shower device is arranged at crystallizer narrow-face foot roller fixed head lower end and is fixedly connected with it, described strand bight Non-contact Infrared Temperature Measurement device is arranged at cool water shower device lower end and is fixedly connected with it, described host computer input connects strand bight Non-contact Infrared Temperature Measurement device, the output of host computer connects the input of PLC, and the output of PLC connects cool water shower device.
2. the control system of continuous casting billet bight grain refinement according to claim 1, it is characterized in that, described adapted to casting blank section change width for the cool water shower device of strand bight spraying cooling, this device comprises: spraying rack and shower, and described spraying rack comprises a vertical main fixed bar and multiple shower connecting rods of level;
Wherein, described main fixed bar is fixedly connected with the horizontal centre position of shower connecting rod and communicates, form water supply loop, described multiple shower connecting rods are arranged in main fixed bar along casting flow path direction by same intervals width, and described shower connecting rod two ends are respectively provided with shower.
3. the control system of continuous casting billet bight grain refinement according to claim 2, it is characterized in that, described shower is installed on the two ends of each shower connecting rod according to certain angle, described certain angle is: when outer arc angle portion in strand aimed at by shower, the angle that shower and shower connecting rod are formed; Described shower, its nozzle is circle or the flat nozzle with 60 ° ~ 80 ° of spray angles.
4. the control system of continuous casting billet bight grain refinement according to claim 2, is characterized in that, it is concordant that described main fixed bar lower end and strand found curved segment buckled zone entrance.
5. the control system of continuous casting billet bight grain refinement according to claim 2, is characterized in that, described water supply loop is connected with crystallizer narrow-face foot roller section water supply loop.
6. the control system of continuous casting billet bight grain refinement according to claim 1, it is characterized in that, described leads to compressed-air actuated strand bight Non-contact Infrared Temperature Measurement device, this device comprises: can lead to compressed-air actuated infrared temperature probe fixed mount and infrared temperature probe, and described infrared temperature probe fixed mount comprises: the infrared temperature probe connecting rod of a vertical main fixed bar of infrared temperature probe, two levels and four infrared temperature probe placing devices;
Wherein, the main fixed bar of described infrared temperature probe is fixedly connected with the horizontal centre position of infrared temperature probe connecting rod and communicates, form ventilating return, the infrared temperature probe connecting rod of two described levels lays respectively at strand and founds curved segment buckled zone entrance and strand stands curved segment exit, described infrared temperature probe placing device is arranged at infrared temperature probe connecting rod two ends, and it is inner that infrared temperature probe is arranged at infrared temperature probe placing device.
7. the control system of continuous casting billet bight grain refinement according to claim 6, it is characterized in that, described infrared temperature probe placing device, its one end communicates with infrared temperature probe connecting rod, the other end is opening, this opening aims at outer arc angle portion in strand, and infrared temperature probe placing device inside is provided with the draw-in groove for fixing infrared temperature probe, and above-mentioned draw-in groove is circumferentially evenly distributed with the through hole for blast injection.
8. the control system of continuous casting billet bight grain refinement according to claim 6, it is characterized in that, described infrared temperature probe main fixed bar upper end is fixedly connected with outside the main fixed bar of spraying rack, and infrared temperature probe main fixed bar upper end is concordant with the main fixed bar upper end of spraying rack, the main fixed bar upper end of infrared temperature probe is connected with compressed air piping.
9. the control system of continuous casting billet bight grain refinement according to claim 6, is characterized in that, the output line of described infrared temperature probe is connected with host computer with compressed air piping by infrared temperature probe fixed mount.
10. the control method adopting the control system of continuous casting billet bight grain refinement according to claim 1 to carry out, is characterized in that, comprise the following steps:
Step 1, according to the complete ferritizing temperature of produced steel grade and complete austenitizing temperature requirement, determine the target surface temperature of continuous casting billet bight in the completely ferritizing and vertical curved segment exit complete austenitizing in vertical curved segment buckled zone porch, and be arranged in host computer;
Step 2, according to set target surface temperature, adopt numerical simulation computational methods to simulate the temperature field in the cold sufficient roller Duan Yuli curved segment of continuous casting billet two, thus the cold sufficient roller section of the casting machine two determining to meet above-mentioned target surface temperature requirement wide initial water yield, the initial water yield of the cold foot roller segment narrow surface of casting machine two, the four initial water yields in district and casting blank section change width can be adapted to and for the initial water yield of cool water shower device of strand bight spraying cooling in the three initial water yields in district, vertical curved segment in the two initial water yields in district, vertical curved segment in vertical curved segment;
Step 3, start up system, cool water shower device sprays outer arc angle portion in strand, and adopt the surface temperature of the current continuous casting billet of infrared temperature probe Real-Time Monitoring in each bight of vertical curved segment buckled zone entrance and vertical curved segment exit, and the temperature value of collection is sent in host computer carries out periodicity storage;
Step 4, target surface temperature according to the temperature value and the setting that gather, regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, the cooling water inflow that issues that stands curved segment two district and cool water shower device water route, concrete steps are as follows:
Step 4-1, according to the cycle gathered, to gathered vertical curved segment buckled zone entrance four strand bight temperature averaged respectively;
Whether step 4-2, judgement vertical curved segment buckled zone entrance strand each bight temperature averages are greater than the target surface temperature value of setting, if so, then perform step 4-3, otherwise, perform step 4-4;
Step 4-3, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient are 1, and cool water shower device water route increment of adjustment coefficient is 2, performs step 4-7;
Whether step 4-4, the vertical absolute difference between curved segment buckled zone entrance strand each bight temperature averages and the target surface temperature value of setting of judgement are less than or equal to the tolerance of setting, if so, then perform step 4-5, otherwise, perform step 4-6;
Step 4-5, cold wide of the sufficient roller section of setting casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient are 0, perform step 4-7;
Step 4-6, set cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district water route increment of adjustment coefficient as-1, upper cool water shower device water route increment of adjustment coefficient is-2, execution step 4-7;
Step 4-7, cold wide of the sufficient roller section of casting machine two according to setting, leptoprosopy, vertical curved segment two district and cool water shower device water route increment of adjustment coefficient, be multiplied by increment of adjustment, automatically regulate cold wide of the sufficient roller section of casting machine two, leptoprosopy, vertical curved segment two district and cool water shower device water route issue cooling water inflow;
Step 4-8, according to the cycle gathered, to four, gathered vertical curved segment exit strand bight temperature averaged respectively;
Whether step 4-9, judgement vertical strand each bight, curved segment exit temperature averages are less than the target surface temperature value of setting, if so, then perform step 4-10, otherwise, perform step 4-11;
Step 4-10, set the water route increment of adjustment coefficient in casting machine two Leng Sanqu and 4th district as-1, perform step 4-14;
Whether step 4-11, the vertical difference between curved segment exit strand each bight temperature averages and the target surface temperature value of setting of judgement are less than or equal to the tolerance of setting, if so, then perform step 4-12, otherwise, perform step 4-13;
The water route increment of adjustment coefficient in step 4-12, setting casting machine two Leng Sanqu and 4th district is 0, performs step 4-14;
The water route increment of adjustment coefficient in step 4-13, setting casting machine two Leng Sanqu and 4th district is 1, performs step 4-14;
Step 4-14, water route increment of adjustment coefficient according to casting machine two Leng Sanqu and 4th district of setting, be multiplied by increment of adjustment, automatically adjustment casting machine two Leng Sanqu and four water routes, district issue cooling water inflow;
Step 5, return perform step 3, until throwing terminates.
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Application publication date: 20151118 Assignee: TIANJIN IRON & STEEL GROUP Co.,Ltd. Assignor: Northeastern University Contract record no.: X2020210000020 Denomination of invention: A control system and method for corner grain refinement of continuous casting billet Granted publication date: 20170412 License type: Common License Record date: 20201106 |